STYLE ‘A’ (FAILSAFE)

THERMOSTATIC TEMPERATURE REGULATOR

MIL-V-19772A and MIL-DTL-19772B TYPE I (3-WAY) / TYPE II CLASS 1 / TYPE II CLASS 2

SUITABLE FOR SHIPBOARD SERVICE

TRAC Regulator Company Inc. 160 South Terrace Avenue

Mount Vernon, New York USA 10550-2408

Phone: (914) 699-9352 Fax: (914) 699-9367

GENERAL INFORMATION

INTRODUCTION The Trac Style ‘A’ (Failsafe) Temperature Regulator is a self sensing and self actuated temperature regulating valve which will automatically control liquid or steam flow through the valve in response to changes in the temperature of the controlling medium. The regulating valve requires no external source of power to operate the valve or to detect changes in the temperature of the controlling medium. The valve can be set to control at any temperature within the limits of the temperature range stamped on the nameplate.

PRINCIPLES OF OPERATION The actuator of the Trac Style ‘A’ (Failsafe) Temperature Regulator is a hermetically sealed system consisting of a thermostatic sensing bulb which is connected to a bellows assembly by armored capillary tubing. Upon an increase in temperature at the sensing bulb the liquid within the bulb expands and begins to generate vapor pressure. The vapor pressure generated within the bulb is transmitted through the capillary tubing to the bellows, causing it to expand. The bellows amplifies the vapor pressure, generating the necessary thrust to operate the valve. An increase in temperature at the bulb tends to push the stem downward. Failsafe is a term invoked by the military specification to differentiate this type of equipment from the standard (non-failsafe) design. It describes the failure mode which the system designer must consider as safest for the system. For most applications where the Trac Style ‘A’ (Failsafe) Temperature Regulator is specified, the valve is intended to fail cold. The failsafe temperature regulator will fail in the full open or full closed position (depending on valve action) with no means to adjust the valve to an intermediary position. If adjustment to an intermediate position after thermostatic element failure is a system requirement, consider the Trac Style ‘B’ temperature regulator.

VALVE ACTION The Trac Style ‘A’ Temperature Regulator is available in three basic types of valve action:

Note: The military specification type and class generally associated with each type of valve action is included below. Departures from the military specification valve are available- these modifications include but are not limited to changes in body material, trim material, end connections, and rated pressure.

DIRECT ACTING: Direct acting valves are used for heating services where a rise in

temperature tends to close the valve. A direct acting valve is generally used for controlling the temperature of any steam heated systems such as hot water tanks, steam tables, sterilizing equipment, etc…

MIL-V-19772A / MIL-DTL-19772B TYPE II CLASS 1 (Failsafe) REVERSE ACTING: Reverse acting valves are used for cooling services where a rise in

temperature tends to open the valve. A reverse acting valve is generally used for controlling the temperature of cooling system recirculating lines, heat exchangers, environmental air cooling, etc…

MIL-V-19772A / MIL-DTL-19772B TYPE II CLASS 2 (Failsafe) THREE WAY: 3-Way valves are used for mixing hot and cold liquids to deliver liquid to the

outlet at a predetermined temperature, or to divert the inlet flow of liquid to a heat exchanger or bypass based on the controlling condition.

MIL-V-19772A / MIL-DTL-19772B TYPE I (Failsafe)

BODY AND TRIM CATEGORIES

DIRECT ACTING (A RISE IN TEMPERATURE CLOSES THE VALVE)

SINGLE SEAT (CONE DISC)

AVAILABLE SIZES: 1/4” THRU 1/2”

BODY: BRONZE TRIM: STAINLESS STEEL SILBRAZ UNION END PER MIL-F-1183 (For availability of flanged end or NTP tailpiece consult factory) VALVE SPECIFICATION: COMMERCIAL PRESSURE RATING (PSIG): 100, 150, 250

BALANCED SINGLE SEAT

AVAILABLE SIZES: 1/2” THRU 2”

BODY: BRONZE TRIM: STAINLESS STEEL SILBRAZ UNION END PER MIL-F-1183 (For availability of flanged end or NTP tailpiece consult factory) VALVE SPECIFICATION: TYPE II CLASS 1 PRESSURE RATING (PSIG): 100, 150, 250

DOUBLE SEAT DIRECT ACTING (UNION)

AVAILABLE SIZES: 1/4” THRU 2”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL SILBRAZ UNION END PER MIL-F-1183 (For availability of NTP tailpiece consult factory) VALVE SPECIFICATION: TYPE II CLASS 1 PRESSURE RATING (PSIG): 100, 150, 250

DOUBLE SEAT DIRECT ACTING (FLANGED)

STANDARD SIZES: 2-1/2” THRU 5” AVAILABLE SIZES: 1/2” THRU 5”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL FLANGED END PER MIL-F-20042 (For availability of flanged end per ANSI-B16.24 or ANSI-B16.5 consult factory) VALVE SPECIFICATION: TYPE II CLASS 1 PRESSURE RATING (PSIG): 100, 150, 250

BODY AND TRIM CATEGORIES

REVERSE ACTING (A RISE IN TEMPERATURE OPENS THE VALVE)

DOUBLE SEAT REVERSE ACTING (UNION)

AVAILABLE SIZES: 1/4” THRU 2”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL SILBRAZ UNION END PER MIL-F-1183 (For availability of NTP tailpiece consult factory) VALVE SPECIFICATION: TYPE II CLASS 2 PRESSURE RATING (PSIG): 100, 150, 250 DOUBLE SEAT REVERSE ACTING (FLANGED)

STANDARD SIZES: 2-1/2” THRU 5” AVAILABLE SIZES: 1/2” THRU 5”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL FLANGED END PER MIL-F-20042 (For availability of flanged end per ANSI-B16.24 or ANSI-B16.5 consult factory) VALVE SPECIFICATION: TYPE II CLASS 2 PRESSURE RATING (PSIG): 100, 150, 250

BODY AND TRIM CATEGORIES

3-WAY

3-WAY (UNION)

AVAILABLE SIZES: 1/4” THRU 2”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL SILBRAZ UNION END PER MIL-F-1183 VALVE SPECIFICATION: TYPE I PRESSURE RATING (PSIG): 100, 150

3-WAY (FLANGED)

STANDARD SIZES: 2-1/2” THRU 6” AVAILABLE SIZES: 1/2” THRU 6”

BODY: BRONZE TRIM: BRONZE, STAINLESS STEEL, or MONEL FLANGED END PER MIL-F-20042 (For availability of flanged end per ANSI-B16.24 or ANSI-B16.5 consult factory) VALVE SPECIFICATION: TYPE I PRESSURE RATING (PSIG): 100, 150

3-WAY MIXING AND DIVERTING SERVICE

(A RISE IN TEMPERATURE CLOSES PORT B AND OPENS PORT C)

3-WAY (MIXING SERVICE)

BODY TAGS

PORT A: OUTLET PORT B: HOT INLET PORT C: COLD INLET

3-WAY (DIVERTING SERVICE)

BODY TAGS

PORT A: INLET PORT B: BYPASS PORT C: COOLER

DETAILED DESCRIPTION

FAIL POSITION Should the thermostatic element fail in operation, the bellows will have lost it’s ability to pull back on the valve stem, allowing the main valve spring to expand unhindered. Spring expansion will force the main valve down. The failure mode will depend on the type valve action of the installed regulator. Fail position for the three basic types of valve action are as follows:

DIRECT ACTING: Fails Closed (In a heating system service the valve fails cold)

REVERSE ACTING: Fails Open (In a cooling system service the valve fails cold)

THREE WAY (Mixing Service): Fails Cold (Hot seat shut)

THREE WAY (Diverting Service): Fails To Cooler (Bypass seat shut)

HOW IT WORKS

The bracket assembly consists of the bracket (yoke), adjustment stem, adjusting spring, and adjusting wheel. The adjusting spring position is fixed on one end within the spring housing of the bracket assembly. The other end of the adjusting spring moves with the bellows, adjustment stem, and main valve stem. This design allows for the fail cold (failsafe) feature and also changes the way the valve set point is adjusted. Temperature adjustment is discussed later. While the liquid filled thermostatic element is cold the bellows assembly exerts a compressive force on the main valve spring which tends to pull the stem back against the main valve spring (upward movement). As liquid in the bulb is heated vapor pressure within the bulb transmits this pressure hydraulically to the bellows. As the bellows expands, the force of vapor pressure assisted by the main valve spring will tend to push on the stem (downward movement).

BELLOWS STEM (BELLOWS ASSEMBLY) ADJUSTING STEM SPRING HOUSING ADJUSTING SPRING ADJUSTING WHEEL BRACKET

Figure 1- BRACKET ASSEMBLY

THERMOSTATIC ELEMENT SELECTION

STANDARD BULB (SILBRAZ/ SOCKET WELD)

The Standard bulb is provided with an 1-1/2” Brass Silbraz bulb bushing (socket weld is available). The copper capillary is armored along it’s entire length and is reinforced at both ends (Stainless steel capillary and armor are available upon request). BULB MATERIALS: COPPER, STEEL, STAINLESS STEEL, COPPER/NICKEL, MONEL

STANDARD BULB (FLANGED)

The flanged bulb is available in accordance with the following flange specifications. FLANGE SPECIFICATIONS: MIL-F-20042, ANSI-B16.24, ANSI-B16.5 (Stainless steel capillary and armor are available upon request). BULB/FLANGE MATERIALS: COPPER/BRONZE, STEEL, STAINLESS STEEL, MONEL

STANDARD BULB DIMENSIONS (SILBRAZ/ SOCKET WELD & FLANGED)

BODY STYLE

VALVE SIZE

Ranges Starting Over 120 Deg.F

Ranges Starting Under 120 Deg.F

1/4” to 2” 3/4” x 12” 1-1/8” x 12” TWO WAY 2-1/2” to 5” 1” x 15” 1-1/8” x 30”

1/2” to 2” 3/4” x 12” 1-1/8” x 12” 2-1/2” 1” x 15” 1-1/8” x 36”

THREE WAY

3” to 5” 1” x 19” 1-1/8” x 36”

FINNED BULB

The finned bulb is designed for air duct mounting and is provided with a duct mounting flange kit. The copper capillary is armored along it’s entire length and is reinforced at both ends. BULB MATERIAL: COPPER

FINNED BULB DIMENSIONS

VALVE SIZE

Ranges Starting Over 120 Deg.F

Ranges Starting Under 120 Deg.F

1/4” to 2” 1-1/2” OD fins x 12” 1-7/8” OD fins x 12” 2-1/2” to 5” 1-3/4” OD fins x 12” 1-7/8” OD fins x 30”

INSTALLATION

The temperature regulating valve must be clean and free from packing material and other foreign matter before installing into a clean pipeline. Connect the valve into the pipe line so that the flow is in the direction indicated by the arrow cast on the body. The valve will work equally well in any position, but it is preferable to install the valve with the adjusting spring vertically upward. This will minimize wear on all moving parts.

LOCATION AND INSTALLATION OF THERMAL BULB

Correct bulb position and bulb location are vitally important factors in obtaining accurate temperature control. BULB POSITION (See figure 2 for details) The standard thermostatic element can be installed horizontally, vertically, or at any other angle as long as the bulb mounting flange is uppermost. When mounting the bulb horizontally, be sure that the word “TOP” stamped on the bulb mounting flange is on top. The bolt pattern for the four (4) stainless steel screws in the figure below is shown rotated by 45 degrees. When brazing or welding the bulb bushing into the piping system, be sure that the bolt pattern straddles the horizontal and vertical center lines. The standard thermostatic element cannot be installed vertically with the bulb mounting flange lowermost. For this type of installation a Vertical Bottom Mount (VBM) thermostatic element must be specified.

Figure 2- HORIZONTAL TEE INSTALLATION

INSTALLATION

LOCATION AND INSTALLATION OF THERMAL BULB

BULB LOCATION (See Typical Installations for details)

INSTANTANEOUS HEATERS: The bulb should be installed in the heater outlet line and as close as possible to the point where this line comes out of the heater.

STORAGE HEATERS: The bulb should be installed in the storage heater tank higher than the heating surface or coil, but not directly over it. The bulb should be no closer than 4 inches to the heating surface.

3-WAY REGULATOR: The bulb should be installed as close as possible to the regulator. For mixing service the bulb should be installed in the common outlet line. For diverting service the bulb should be installed in the common inlet line.

ADDITIONAL COMMENTS:

When the bulb is installed in a Tee fitting, ensure that the maximum possible surface of the bulb is in contact with the flow of the controlling medium. Installation of the bulb in dead areas of piping is to be avoided.

It is recommended that the length of pipe containing the bulb be enlarged to ensure unrestricted flow around the bulb.

For optimal regulation accuracy, the capillary length should be kept to a minimum.

Separable socket wells are available in order to remove the thermo element without draining the system. Using a separable socket well generally will slow the response time of the regulator.

SEPARABLE SOCKET WELL

Separable socket wells are available with silbraz, socket weld, NPT, or flanged connections in accordance with the following specifications.

BUSHING TYPE: 1-1/2” SILBRAZ/SOCKET WELD (MIL-F-1183/NAVSEA 803 6397430) (NPT per ANSI/ASME B1.20.1 available upon request) BULB/BUSHING MATERIALS: COPPER/BRASS, STEEL, STAINLESS STEEL, MONEL, COPPER NICKEL FLANGE SPECIFICATIONS: MIL-F-20042, ANSI-B16.24, ANSI-B16.5 BULB/FLANGE MATERIALS: COPPER/BRONZE, STEEL, STAINLESS STEEL, MONEL, COPPER NICKEL

TEMPERATURE ADJUSTMENT

By turning the adjustment wheel the operator can change the temperature at which the valve will begin to open (within the range stamped on the nameplate). To increase the controlling temperature, decrease the spring tension by rotating the adjustment wheel away from the bellows. To decrease the controlling temperature, increase the spring tension by rotating the adjustment wheel toward the bellows. See Figure 1 for illustration of temperature adjustment mechanism.

To raise the set temperature: Turn the adjusting wheel clockwise (looking from the top of the regulator). To decrease the set temperature: Turn the adjusting wheel counterclockwise (looking from the top of the regulator).

Wait until the temperature at the bulb stabilizes at one steady reading. It may be necessary to adjust the adjustment wheel incrementally to obtain the desired set temperature.

ORDERING INFORMATION

MANDATORY INFORMATION

In order to correctly size a temperature regulating valve for a particular application, the user must have a complete understanding of the conditions at the valve. As a minimum, the user should know the following conditions: SET TEMPERATURE (REQUIRED TEMPERATURE RANGE) This is the temperature that the regulator is required to maintain during normal operation. The valve can be set to control at any temperature within the limits of the temperature range stamped on the nameplate. If the actual set temperature is not known, specify the range of expected temperature settings.

STANDARD RANGES (Deg. F) Ranges Starting Under 120 Deg.F Ranges Starting Over 120 Deg.F

40-70 80-110 125-155 180-210 50-80 95-125 140-170 195-225 65-95 110-140 165-195

CAPILLARY LENGTH The capillary length from the temperature regulator to the bulb installation location should be kept to a minimum. Generally this length is specified between 8 and 15 feet. Capillary length over 15 feet is available but not recommended. The standard capillary length of the temperature regulating valves described herein is 10 feet. MAXIMUM INLET PRESSURE This is the maximum pressure that the temperature regulating valve will be subjected to under any operating conditions. This value is used to choose the appropriate pressure rating of the valve and to establish the end connection rating. Be sure to specify whether union end or flanged end connections are preferred.

PRESSURE RATINGS AND AVAILABLE END CONNECTIONS RATED PRESSURE (PSIG) UNION END FLANGED END

100 (Military) MIL-F-1183 MIL-F-20042 150 (Military) MIL-F-1183 (150 Mod) ANSI-B16.5 250 (Military) MIL-F-1183 MIL-F-20042 700 (Military) Not Available NAVSEA 810-1385861

150 (Commercial) NPT Tailpiece Available ANSI-B16.24 or ANSI-B16.5 250 (Commercial) NPT Tailpiece Available ANSI-B16.24 or ANSI-B16.5

MINIMUM INLET PRESSURE It is of primary importance to know the minimum inlet pressure at the valve. This value is used in calculating the appropriate size of the temperature regulating valve. REQUIRED CAPACITY (AT MINIMUM INLET PRESSURE) In most cases inlet pressure varies widely from maximum to minimum inlet pressure values. To correctly size a temperature regulating valve for a particular application, the required flow at minimum inlet pressure must be known. ALLOWABLE PRESSURE DROP ACROSS VALVE The allowable pressure drop across the valve is also necessary to correctly size a temperature regulating valve. If the actual pressure drop is not known or not given, it is assumed to be 5 psig for sizing purposes.

REFERENCE DATA

NAMEPLATE For specific information regarding an installed Trac Style ‘A’ temperature regulator, consult the nameplate (Figure 3) affixed to the bracket of each production valve. For operating characteristics of a valve installed in a particular shipboard system consult the applicable certification data sheet or ship’s drawing index. When contacting Trac Regulator Co.,Inc. regarding troubleshooting, repair, or replacement, please have the following nameplate information available: Valve ID Number and Serial Number.

SPEC DO NOT POLISH

TYPE CLASS SERIES SIZE

CAPACITY RANGE

BODY TRIM STYLE

VALVE ID SERIAL

CID TECH. MAN. TRAC REGULATOR CO. INC. MOUNT VERNON, NY USA

Figure 3 NAMEPLATE

CAPACITY TABLES

The water and steam capacity tables provided herein are for reference only and should be used only to determine wide open flow. In applications where accuracy of regulation and flow vs. temperature change requirements are critical, consult the minimum capacity tables of the valve specification (Performance Requirements section 3.5 of MIL-V-19772A or Performance Requirements section 3.4 of MIL-DTL-19772B as applicable).

Note: A typographical error exists in MIL-DTL-19772B Table VII “capacity for type II class 1” valves- units of flow should be indicated in lbs/hr of steam.

SPACE ENVELOP DIMENSIONS

The space envelope dimensions provided herein are for reference only and should be not be interpreted as the only available valve configurations. Other face to face (flanged) and end to end (union) dimensions are available to meet specific fit requirements. Custom fit configurations may be developed upon request, consult Trac Regulator for more information.

SPACE ENVELOPE DIMENSIONS

2-WAY VALVES

SPACE ENVELOPE DIMENSIONS

3-WAY VALVES